Submission #381880

#	Time	Username	Problem	Language	Result	Execution time	Memory
381880		pavement	Connecting Supertrees (IOI20_supertrees)	C++17	Compilation error	0 ms	0 KiB

supertrees

#include <bits/stdc++.h>
using namespace std;

int link[1005], sz[1005];
vector<int> vec[1005];

int find(int x) {
	if (x == link[x]) return x;
	return link[x] = find(link[x]);
}

void unite(int a, int b) {
	a = find(a);
	b = find(b);
	if (sz[b] > sz[a]) swap(a, b);
	sz[a] += sz[b];
	for (int i : vec[b]) vec[a].push_back(i);
	link[b] = a;
}

int construct(vector<vector<int> > p) {
	int n = p.size();
	for (int i = 0; i < n; i++) {
		link[i] = i;
		sz[i] = 1;
		vec[i].push_back(i);
	}
	vector<vector<int> > b(n, vector<int>(n));
	for (int i = 0; i < n; i++) {
		for (int j = i + 1; j < n; j++)
			if (p[i][j]) unite(i, j);
	}
	for (int i = 0; i < n; i++) {
		if (find(i) != i) continue;
		int prv = -1;
		for (int j : vec[i]) {
			if (prv != -1) b[prv][j] = b[j][prv] = 1;
			prv = j;
		}
	}
	build(b);
	return 1;
}

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:41:2: error: 'build' was not declared in this scope
   41 |  build(b);
      |  ^~~~~